Eric Lee / smarc-fsl-linux-kernel

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net/netfilter/nft_dup_netdev.c 2.52 KB
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502061f81   Pablo Neira Ayuso   netfilter: nf_tab... 
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  /*
   * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published by
   * the Free Software Foundation.
   */
  
  #include <linux/kernel.h>
  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/netlink.h>
  #include <linux/netfilter.h>
  #include <linux/netfilter/nf_tables.h>
  #include <net/netfilter/nf_tables.h>
  #include <net/netfilter/nf_dup_netdev.h>
  
  struct nft_dup_netdev {
  	enum nft_registers	sreg_dev:8;
  };
  
  static void nft_dup_netdev_eval(const struct nft_expr *expr,
  				struct nft_regs *regs,
  				const struct nft_pktinfo *pkt)
  {
  	struct nft_dup_netdev *priv = nft_expr_priv(expr);
  	int oif = regs->data[priv->sreg_dev];
  
  	nf_dup_netdev_egress(pkt, oif);
  }
  
  static const struct nla_policy nft_dup_netdev_policy[NFTA_DUP_MAX + 1] = {
  	[NFTA_DUP_SREG_DEV]	= { .type = NLA_U32 },
  };
  
  static int nft_dup_netdev_init(const struct nft_ctx *ctx,
  			       const struct nft_expr *expr,
  			       const struct nlattr * const tb[])
  {
  	struct nft_dup_netdev *priv = nft_expr_priv(expr);
  
  	if (tb[NFTA_DUP_SREG_DEV] == NULL)
  		return -EINVAL;
  
  	priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
  	return nft_validate_register_load(priv->sreg_dev, sizeof(int));
  }
  
  static const struct nft_expr_ops nft_dup_netdev_ingress_ops;
  
  static int nft_dup_netdev_dump(struct sk_buff *skb, const struct nft_expr *expr)
  {
  	struct nft_dup_netdev *priv = nft_expr_priv(expr);
  
  	if (nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev))
  		goto nla_put_failure;
  
  	return 0;
  
  nla_put_failure:
  	return -1;
  }
  
  static struct nft_expr_type nft_dup_netdev_type;
  static const struct nft_expr_ops nft_dup_netdev_ops = {
  	.type		= &nft_dup_netdev_type,
  	.size		= NFT_EXPR_SIZE(sizeof(struct nft_dup_netdev)),
  	.eval		= nft_dup_netdev_eval,
  	.init		= nft_dup_netdev_init,
  	.dump		= nft_dup_netdev_dump,
  };
  
  static struct nft_expr_type nft_dup_netdev_type __read_mostly = {
  	.family		= NFPROTO_NETDEV,
  	.name		= "dup",
  	.ops		= &nft_dup_netdev_ops,
  	.policy		= nft_dup_netdev_policy,
  	.maxattr	= NFTA_DUP_MAX,
  	.owner		= THIS_MODULE,
  };
  
  static int __init nft_dup_netdev_module_init(void)
  {
  	return nft_register_expr(&nft_dup_netdev_type);
  }
  
  static void __exit nft_dup_netdev_module_exit(void)
  {
  	nft_unregister_expr(&nft_dup_netdev_type);
  }
  
  module_init(nft_dup_netdev_module_init);
  module_exit(nft_dup_netdev_module_exit);
  
  MODULE_LICENSE("GPL");
  MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
  MODULE_ALIAS_NFT_AF_EXPR(5, "dup");